A blockbuster title match between the ATP World Tour’s Top 2 players is set for the Barclays ATP World Tour Finals - just the fourth all-Top 2 final in the 43-year history of the year-end tournament. It’s the second time in three years the top two are meeting in the final. It’s also the first time since 2004 two former year-end champions are in the final (Federer d. Hewitt).

• World No. 1 Novak Djokovic squares off with No. 2 Roger Federer, who leads the head-to-head rivalry 16-12 (tied 2-2 this year). Federer has won their last two meetings in the semi-finals of Wimbledon and final of Cincinnati in August. Federer has a 4-3 advantage in finals and leads 3-1 indoors. In their only previous meeting at this tournament (and last indoors) two years ago, Federer won the semi-final 61 64. After that loss Djokovic went on a historic 43-match winning streak into June 2011. Here are the four times the World No. 1 and No. 2 have met in the final of the season finale:- 2012: No. 1 Djokovic vs. No. 2 Federer
- 2010: No. 2 Federer d. No. 1 Nadal
- 1986: No. 1 Lendl d. No. 2 Becker
- 1983: No. 2 McEnroe d. No. 1 Lendl

what i don't get is that mcenroe is supposed to have ended 1983 as #1. this #1 spot is probably a "post-masters" ranking (as the masters was played in early january at the time) but no ATP points were awarded for the masters until 1990...
so what happened with the rankings ?
(moose, maybe ?)